There should be an option for users to save workouts that they want to do. If they are following multiple people and boxes, they can browse the workouts that everyone comes up with and save which ones they want to do later in the week. Bonus points if you manage to include a scheduling option, so users can set which day they want to do the workout and Kilomodo can send either a reminder or simply just have a calendar that shows which workouts you plan to do each day.